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Old 08-09-2017, 06:16 AM   #1
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Black water clean out Passport

I have a 2015 Passport and when I hook a hose up to the black water clean out nothing happens. I've looked for a valve or something that may be causing it not to work. Any ideas would be helpful.

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Old 08-09-2017, 06:49 AM   #2
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Your situation has not happened to us. We hooked the clean out hose up to the black water clean out on our TT, and water ended up spraying all through the interior of the camper! My husband replaced waterlines and connectors with PEX lines. Just be aware of what could happen.
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Old 08-09-2017, 07:34 AM   #3
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First a question: Has it ever worked??? If it worked "last year, but not now" then I'd suspect that you have "gunk" dried on the openings of the tank spray head. Often, over the winter, the black tank will dry out. If there was a "wad of tissue" that floated over the spray head during dumping/winterizing last year, that tissue may have become "cement to plug the spray head" and you'll need to fill the black tank, let it sit several days to "soften the cement" and then try to "spray it away" with water pressure through the black tank flush system. If that doesn't work,

The anti-siphon valve may be installed backwards. Essentially, it's a "one way valve" that prevents water from flowing "in reverse". So, if it's installed backwards, it would stop water from flowing into the black tank.

Typically, the anti-siphon valve is located under the bathroom sink, "way up high" nestled between the faucet connections. It'll look similar to this picture and may have blue or usually white PEX tubing connected to it.

If the anti-siphon valve is installed correctly, then the next likely cause would be a 'kink" in the PEX tubing, somewhere through the system. You might try removing the anti-siphon valve and try blowing air through from the trailer sidewall connection to the valve fitting. If you get air in that part of the system, then the kink or the plug would be from the valve to the tank. That probably would entail removing the coroplast from the trailer bottom so you can inspect/repair the plugged line.

My bet, from long distance guessing, is that you've got "gunk" dried on the spray head inside the tank.

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Old 08-09-2017, 07:36 AM   #4
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We had the same problem in our previous camper (2014 Laredo) and had the dealer look into the problem at the end of that camping season. It turns out the check-valve in the black tank flush line was installed backwards at the factory. Since we had the camper for less than a year, this was a warranty fix.
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Old 08-09-2017, 09:06 AM   #5
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I've read several cases on this and other forums of backward anti-siphon/check valves at various points in the plumbing systems. Even in our previous "bricks and sticks" house, someone had installed a shutoff valve backward that was killing the water pressure to the outside water faucet. These things typically have arrows on them or only fit one way. Can they really be that difficult to install correctly?

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Old 08-09-2017, 09:30 AM   #6
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When running wires for my observation camera, I noticed that my blank tank flush ptex line was kinked 90 degrees after the antis-syphon valve under the floor. I cut out the kinked portion and installed a 90 degree fitting.

May be worth checking if your ptex line also kinked over time.
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Old 08-09-2017, 09:37 AM   #7
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I've had two issues, the check valve under the sink and a clogged input line. I dry camp alone for several weekends and usually wait for a full hookup site before I dump. This has caused the tank level to rise and back feed into the input line. I've had to drop the colorplast and disconnect the flush input to the tank and clean out both the fixture in the tank by poking at it with a piece of wire and also the external elbow that connects to the line. A crappy situation to say the least.

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